It would seem to me, the whole purpose of posting articles to a site, (besides being socially resposnisible and morally upright) would be to get that prescious little link.
The Nofollow negates that (to what degree I am unsure)
If being the aforemention socially responsible, morally upright and getting collateral visitation is not reward enough for posting,then I would not expend the effort in those directions (for
SEO purposes)